The first Americanspacecraft expected to land on the moon in nearly 50 years will be an unmanned robotic lander built by closely held Astrobotic Technology Inc and launched in two years by United Launch Alliance's Vulcan rocket, the companies told Reuters on Monday. Astrobotic was one of nine companies chosen in November to compete for $2.6 billion to develop small space vehicles and other technology for 20 missions to explore the lunar surface over the next decade. Pittsburgh-based Astrobotic picked Vulcan, being developed by a joint venture of Boeing Co and Lockheed Martin Corp, to launch its Peregrine lander from Florida's Cape Canaveral in summer 2021.